(svn r23525) -Codechange: make Window::flags4 WindowFlags instead of uint16, with only values known in WindowFlags (and move out 2 timers to their own variable)
-Codechange: rename Window::flags4 to Window::flags
-Codechange: move some non-inline functions from .hpp to .cpp

(svn r20453) -Codechange: Remove direct accesses to Window::hscroll, vscroll and vscroll2.
Note: All windows get individual members with the same names, which are initialised via Window::GetScrollbar(). This caching is not required at all, but simplifies conversion.

(svn r18781) -Codechange: pass the CommandCost to the callback instead of whether it succeeded or not.
-Fix: AIs did update their last cost incorrectly in network games if the cost of the DC_EXEC phase differed from the ~DC_EXEC phase.

(svn r18283) -Feature: [NewGRF] Add new price bases for removing industries, building/removing unmovables (new objects), building/removing rail-waypoints/buoys, interacting with town-authority, building foundations, funding primary industries (when not prospecting) and towns.
If a GRF does not set price multipliers for these new prices, but for the previously used ones, the old modifiers will be propagated to the new bases.